Leaf-miner: Initially a lower epidermal gallery leading to a grey or whitish
blotch which contorts the leaf strongly. Then at least two folds
on the leaf margin, consuming the upper epidermis (British
leafminers).

The
mine starts as a lower-surface epidermal corridor, that becomes
widened into a blotch. The end result is a small, strongly inflated,
tentiform mine between two side veins. The leaf tissue is eaten
away up to the upper epidermis. The lower epidermis is opaque, mottled
greyish, and strongly folded. Finally the mine is vacated and the
larva continues under a leaf tip of margin that has been folded
downwards; at least two of such folds are made and eaten out from
the inside (Bladmineerders van Europa).

Larva: The larvae of moths have a head capsule and chewing mouthparts with opposable mandibles (see video of a gracillarid larva feeding), six thoracic legs and abdominal legs (see examples).

Time
of year - adults: There are two generations, flying in May and
again in August (UKMoths).

Distribution
in Great Britain and Ireland: Southern half of England and
Wales, ranging northwards to York (UKMoths).
including Anglesey, Bedfordshire, Breconshire, Buckinghamshire, Cambridgeshire, Carmarthenshire, Cheshire, Denbighshire, Dorset, Durham, East Cornwall, East Gloucestershire,
East Kent, East Norfolk, East Suffolk, Glamorgan, Hertfordshire, Huntingdonshire, Isle of Wight, Leicestershire, Middlesex,
Montgomeryshire, North Devon, North Essex, North Hampshire, North Somerset, Pembrokeshire, Shropshire, South Devon, South-west Yorkshire, Stafford, Surrey, West Gloucestershire, West Norfolk and West Suffolk (NBN
Atlas) and the Channel Is. (Fauna Europaea).